sta335bwsqs13tr STMicroelectronics, sta335bwsqs13tr Datasheet - Page 19

• Manufacturer Part Number: sta335bwsqs13tr
• Description: 2.1-channel, High-efficiency Digital Audio System With Qsound Qhd
• Manufacturer: STMicroelectronics

STA335BWSQS
4
Processing data paths
Here after some pictures that represent the data processing paths inside STA335BWSQS. A
first 2-times oversampling FIR filter allows a 2x fs audio processing. Then a selectable high
pass filter removes the DC level. 4 biquads filter allow a full equalization system. A final
crossover filter is present. This filter can eventually be used as a fifth biquad stage, see the
I
control over the signal dynamic respectively before and after the filtering stages. A mixer
function is also available.
Figure 6.
2
Sampling
Sampling
frequency=Fs
frequency=Fs
C registers settings for this specific usage. A prescaler and a final post scaler allow a full
From
From
I2S input
I2S input
interface
interface
R
R
R
R
L
L
L
L
sampling
sampling
STA335BWSQS processing data flow
sampling
sampling
over
over
over
over
FIR
FIR
FIR
FIR
x2
x2
x2
x2
Sampling
Sampling
frequency=2xFs
frequency=2xFs
If DEMP=0
If DEMP=0
If DEMP=0
If DEMP=0
PreScale
PreScale
PreScale
PreScale
User-Defined Mix Coefficients
User-Defined Mix Coefficients
User-Defined Mix Coefficients
User-Defined Mix Coefficients
C1Mx1
C1Mx1
C1Mx1
C1Mx1
C1Mx2
C1Mx2
C1Mx2
C1Mx2
C2Mx1
C2Mx1
C2Mx1
C2Mx1
C2Mx2
C2Mx2
C2Mx2
C2Mx2
C3Mx1
C3Mx1
C3Mx1
C3Mx1
C3Mx2
C3Mx2
C3Mx2
C3Mx2
If HPB=0
If HPB=0
+
+
+
+
+
+
+
+
+
+
+
+
If HPB=0
If HPB=0
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Filter
Filter
Filter
Filter
Crossover Frequency determined by XO Setting
Crossover Frequency determined by XO Setting
Crossover Frequency determined by XO Setting
Crossover Frequency determined by XO Setting
User Defined If XO=0000
User Defined If XO=0000
User Defined If XO=0000
User Defined If XO=0000
Biquad
Biquad
Biquad
Biquad
#1
#1
#1
#1
Low-pass XO
Low-pass XO
Lo-Pass
Lo-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Hi-pass XO
Hi-pass XO
Hi-pass XO
Hi-pass XO
Channel ½
Channel ½
--------------
--------------
Channel ½
Channel ½
--------------
--------------
--------------
--------------
Channel 3
Channel 3
Biquad #5
Biquad #5
Biquad #5
Biquad #5
If DSPB=0 and C2EQBP=0
If DSPB=0 and C2EQBP=0
If DSPB=0 and C1EQBP=0
If DSPB=0 and C1EQBP=0
Biquad
Biquad
Filter
Filter
filter
filter
Filter
Filter
filter
filter
Filter
Filter
filter
filter
User-Defined Filters
User-Defined Filters
User-Defined Filters
User-Defined Filters
Biquad
Biquad
Biquad
Biquad
#2
#2
#2
#2
XO
XO
XO
XO
XO
XO
Biquad
Biquad
Biquad
Biquad
#3
#3
#3
#3
Biquad
Biquad
Biquad
Biquad
#4
#4
#4
#4
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
And
And
And
And
And
And
And
And
And
And
And
And
Vol
Vol
Vol
Vol
Vol
Vol
Vol
Vol
Vol
Vol
Vol
Vol
Emphasis
Emphasis
Emphasis
Emphasis
De-
De-
De-
De-
Processing data paths
If C2TCB=0
If C2TCB=0
BTC: Bass Boost/Cut
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
TTC: Treble Boost/Cut
If C1TCB=0
If C1TCB=0
BTC: Bass Boost/Cut
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
TTC: Treble Boost/Cut
Bass
Bass
Bass
Bass
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
Treble
Treble
Treble
Treble
19/70
R
R
L
L